I would put running, cycling, kayaking, and surfing in the sport category with an asterisk.
If done as a team, or with strategy involved, they could be sports.
Same goes for beach volleyball, ping pong, tennis, or badminton. In your back yard or basement with beer, they are activities. If done to their fullest, they are sports.
Maybe I should put this reply in the “Unpopular Opinion” thread.